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Based on the study of economy development background and character in JINHUA region, with the analysis of six classical spatial growth models and the elaboration of evolution process in JINHUA urban agglomeration, the authors think a sustainable spatial growth model should be as the following forms, some cities were polycentricities, some were sole-core compact cities, and the whole was polycentric urban region. 相似文献
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湖南省城市土地集约利用空间差异研究 总被引:3,自引:2,他引:3
结合湖南省区域发展实际,从土地利用强度、土地利用投入、土地利用效益和土地生态环境质量等方面构建综合评价指标体系,利用主成分分析法对2007年湖南省城市土地集约利用水平进行了综合评价分析,研究结果表明:(1)长沙、株洲、湘潭城市群具有较高的土地集约利用水平;(2)湖南省城市土地利用集约水平存在显著差异,从东到西逐渐降低;(3)城市土地集约利用水平高低主要受经济发展水平的影响,集约度的高低与经济发展水平的高低具有一致性。 相似文献
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长株潭农村居民点时空格局的演变研究 总被引:1,自引:0,他引:1
为了把握长株潭农村居民点时空格局演变的特征,为其空间格局优化提供依据,使农村居民点的分布格局更加合理。利用1996-2007年长株潭土地利用变化数据并运用动态度和相对变化率分析长株潭农村居民点的时空演变过程、特点和规律。结果表明,长株潭农村居民点总体上呈现逐年减少态势,且区域差异明显,农村居民点发展存在一系列问题。提出长株潭农村居民点需要从政府加强引导、科学规划、加强管理力度等3个方面进行调整优化,使空间格局更加合理。 相似文献
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The management of information data for urban sewer systems and the development and characteristics of geography information system are introduced briefly. The recording contents and characteristics of information data and the whole framework of geography information system of urban sewer systems are analyzed in this paper. It is realistic and promising to apply geography information system to the management of urban sewer systems. 相似文献
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The 3D urban planning information system has been the focus topic in urban palnning management. In this paper,the related development of 3D urban planning is reviewed and the development object,data acquisition, system application level and three important characters of 3D urban planning information system have been also discussed. Thus, a system framework iseatablished. Finally,several primary problems are put forward and thought to be resolved to improve the practicability of 3D urban planning information system over large scale. 相似文献
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Web Services is a service-oriented structure and which is really platform-independent and language-independent.In this paper, its system and key technology are analyzed,then aiming at the main problems in information sharing of urban planning information system(UPIS),a UPIS integration framework based on the Web Services is proposed and its principle is studied.Furthermore,an example with realization of UPIS system by ASP.NET in Visual Studio.NET is given. 相似文献
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As far as the urban land structure is mentioned, it means the distribution of urban land among the different industries of the city. The problem of urban land structure is referred as unreasonable allocation of urban land caused by several factors, including the decision making mechanism of old economy and urban development policies. Different from using Fractal theory, Entropy theory and Functional theory, in this paper, with reference to Dissipative Structure Theory, one dynamic, systematic and historical optimization model of Max f(J_i, X_i) with two parameters of J_i and X_i will mainly be set up. This model can be used for analyzing the key factors determining the optimization of urban land structure. 相似文献
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为研究大垫尖翅蝗的空间结构,探索其预测预报方法。运用地统计学中的半变差函数和Kriging插值法对山东省大垫尖翅蝗种群的空间结构进行分析和模拟。结果表明:大尺度下大垫尖翅蝗种群的空间结构均为聚集型,不同方向呈各向异性;全方向及0、45、90、135℃方向的最小聚集范围分别为426.73、320.24、447.55、353.65、85.44 km;空间分布模拟图反映了大垫尖翅蝗在山东的具体分布情况,鲁北滨海地区的发生明显重于其他地区。 相似文献
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Urban planning has always pursued ideal space. Building an exercisable concept is an option for current urban planning. An ideal space has two accessible approaches: an ideal spatial mode applicable to the whole human society, and another mode focusing on the ideal spatial mode which relies on a particular region. “Regional ideal space” can be defined as an imaginary spatial mode recognized by clusters of people during a certain period. With its substantive characteristics of dynamism, diversification and over planning, ideal space is a directional impetus to promote urban evolution. Based on our research, we find that the ideal space mode of the city of Wuhan, P. R. China, has evolved from sandbank to park to unitary city. It is very important to study an ideal space of a city from the perspective of historical evolution of urban form. Studies of this type can promote the evolution of urban form, guide city change, and help people seek the ultimate goal of urban planning, both theoretically and practically. 相似文献
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The Crossing Entropy is defined to scale the similar level of two probability distribution. In many papers on learning BN structure,the Crossing Entropy was used as an indicator of measuring the learning accuracy of an algorithm.The known scoring metrics for learning BN structure is analyzed in this paper,then a new scoring metrics Sum of Mutual Information is proposed based on the information theory.At last,two algorithm for learning BN structure by SIM is represented. 相似文献
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林分空间结构会显著影响其林下植被多样性,为明确其影响灌木物种多样性的关键因子,以八大公山栎类天然次生林为研究对象,计算混交度、大小比数、开敞度指数以及聚集指数代表林分空间结构,计算Margalef指数、Pielou指数和Auclair Goff指数评价灌木物种多样性,并利用Pearson相关系数分析方法探究两者间的相关关系。结果表明,八大公山栎类天然次生林的林下灌木物种多样性变化与开敞度和林木聚集指数之间存在着明显的相互影响关系。开敞度与Pielou指数、聚集指数与Auclair Goff指数表现出明显的相互影响关系;随着开敞度的增大,Pielou指数增大,即林下灌木物种均匀度不断增加;随着八大公山栎类聚集指数增加,Auclair Goff指数增加,即林下灌木的物种多样性程度不断增长。因此,以调整树种结构为主,综合研究调整林木空间的格局和分布,尤其在林木开敞度、聚集度方面能够起到提高八大公山栎类天然次生林下灌木物种多样性的作用。 相似文献
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DOU Jun-feng 《保鲜与加工》2001,(1):1-5
The main urban environmental and urban ecological problems existing in the sustainable development of Chongqing city were introduced in this paper. Furthermore, the causes and features of these problems were analyzed. At last, some countermeasures, which would provide some scientific bases for accelerating the urban sustainable development of Chongqing city, were suggested. 相似文献
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Geographic information systems (GIS) have been widely used in the field of city science. Its timely, accurate and friendly displaying methods have been won more attention from the decision makers. In this paper, several problems,such as system objects, system compositions, and system designing methods etc., were discussed and some suggestions were presented. Three examples were illustrated at the end of the paper. 相似文献
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为探讨城乡统筹背景下的村级土地利用规划空间布局,采用趋势分析法和实证分析法分析了经济社会发展趋势和农业结构调整对土地利用变化的影响,即产业结构发展引导的村域用地空间布局优化。结果表明,产业结构的空间布局有利于土地利用结构的调整和空间布局,带动了区域经济的发展,实现了集约和合理利用土地。由研究可得,土地利用规划中需改革规划思路,突出产业空间结构引导土地利用规划空间布局的战略性地位。 相似文献
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LIU Chang-qi~ 《保鲜与加工》2004,(6):1-5
City residential structure is the main aspect of city spatial structure and in western countries it has been experienced three phases: centripetal collection, centrifugal pervasion and organic collection.From the viewpoint of historical development, the evolvement of residential structure in China can be summarized in three phases: archaic city, neoteric city and modern city.The character of city residential structure is different at different times.However, the residential sub-urbanization and the residential redistribution are the two central forms of the evolvement of residential structure in the modern city. 相似文献
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为了合理规划广西种植业结构,提升广西木薯产业的竞争力,笔者运用探索性空间数据分析方法,对2000、2011、2012、2013年广西88个县区的木薯种植空间分布状态、集聚态势及其变化进行分析,并在此基础上对空间布局演变的影响因素进行初步探讨。结果显示:广西木薯种植有向南部转移的趋势,南北分异显现,2013年广西木薯种植形成了"龙州—富川"分异线,形成了"三足鼎立"态势;广西木薯均呈现显著的正向空间依赖性,且地理集聚现象呈现由减弱到逐步增强态势;Moran散点图的分析结果显示,HH类型和LL类型的区域较多,且HH集聚区内研究单元的个体差异较大;LISA集聚图表明,广西木薯种植在局部范围内存在扩散效应,并呈现北低南高的空间集聚分布格局;自然资源、本地木薯加工厂的能力、比较效益、外出务工劳动人数、农村居民家庭工资性收入等因素的综合作用是空间布局变化的主要原因。研究得出了广西木薯种植的空间相关性,为木薯种植业空间优化和产业发展奠定了坚实基础。 相似文献
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优化城乡建设用地结构与布局是统筹城乡发展、构建和谐社会的重要内容。本研究为了解决在统筹城乡发展过程中如何更好地安排城乡建设用地结构与布局的问题,以河北省藁城市为研究对象,在充分调查河北省藁城市城乡建设用地的现状的基础上,从数量、布局、所占比重等方面分析了城乡建设用地存在的问题。研究认为,城镇规模偏小、土地集约利用程度相对较低、双重用地问题突出、城市化水平低、产业发展竞争力不足等问题是阻碍城乡建设用地结构与布局优化的重要因素,并从科学编制土地利用总体规划、建立土地集约利用评价体系、深化改革、加强土地管理、集约利用土地的城镇化道路等方面提出相应优化藁城市城乡用地结构,推进建设用地整理的对策建议。 相似文献